Nasal snare.



N0. 870,021. PATENTED NOV.- 5, 1907. T. E. DUFFEE.

NASAL SNARE.

APPLICATION FILED JAN. 11. 1907.

WITH E55 E5 -4-ZQZ6M A? /v/m/ s NORRIS PETERS cm, wasmucnm o c THOMAS E. DUFFEE, OF WINOHENDON, MASSACHUSETTS.

N ASAL SNARE.

Specification of Letters Patent.

Patented Nov. 5, 1907.

Application filed January 11, 1907- Serial No. 351.797.

To all whom it may concern:

Be it known that I, THOMAS E. DUFFEE, a citizen of the United States, residing in Winchendon, in the county of Worcester and State of Massachusetts, have invented a new and useful Improvement in Nasal Snares, of which the following is a specification.

ln surgical instruments for these purposes it has hitherto been difficult or impossible for the operator to obtain an unobstructed view of the field of operation and at the same time an easy and natural position which does not cramp the hand or fingers, for the reason that in order to allow the hand to assume a natural and eflicient position it has been necessary to so place it as to interfere with the view of the operator.

This invention has for its principal object to provide a nasal snare or similar instrument for surgical operations in connection with the nose, throat or ear, in which the operator is enabled to hold his hand and fingers in approximately the same position in which they would be held in handling a pistol, whereby they will be below or one side of his line of vision, affording an unobstructed view'oi the field of operation, and at the same time allowing the hand and fingers to assume a position in which the operator obtains an excellent purchase and can apply great power.

The nature of the invention is fully described below, and illustrated in the accompanying drawing, in which a side elevation is shown of a nasal snare embodying my invention or improvement, portions being represented as broken out, and the position of the hands and lingers when the device is operated being indicated by broken lines.

Although I have illustrated the invention as applied to a nasal snare, the wire snare and the cannula containing it are not new in themselves considered, and any substitute therefor may be employed, the invention residing in the frame, handle and operating mechanism.

a represents the horizontal portion of a metallic rod bent downward at a at a slightly obtuse angle into the straight portion 1) which is formed outward into the portion 0 which is bent inward toward the portion Z) at c, and is connected with the portion a by the portion (2. The part a constitutes a horizontal upper brace, and the parts b, c, c and d constitute a handle which is of shape to afford a pistol grip, the inwardly curved portion 0 being adapted to rest between the inner ends of the thumb and index finger. A rod 6 constituting a lower brace extends forward from the portion b of the handle parallel with the brace a, and is screw-threaded to receive the hand-nut or follower f. The forward end of the lower brace c has secured to it by means of a screw 9 a bar h which extends up to the forward end of the brace a to which it is secured by'a screw Ic, thus completing the frame, which consists of the upper brace a, threaded lower brace 6, bar h, and the portion b.

The bar h is provided at its upper end with a tubular extension 7/ into which is screwed the rear end of a cannula 1 containing a small rod 121. to whose front end is threaded a wire snare n in the usual manner. The rear portion of this small rod is threaded to receive a hand-nut p which lies in the bifurcation of the upward extension T (through which the piston extends horizontally), said extension being integral or rigid with a sleeve 8 which slides on the brace a, and which forms a part of a double carriage or slide, comprising said sleeve 8, a sleeve t which slides on the lower brace e, and two rings or finger-pieces u and o, the ring 1) being rigid with and extending downward from the sleeve t, and the ring a being rigid with and connecting the sleeves t and s. Thus the parts r, s, u, t and 7) constitute a single rigid and strong carriage which slides on the portions a and e of the frame, and can be engaged by two fingers above and below the portion 6, whereby great force can be exerted.

In operation, the handle I), c, c and d is grasped with a pistol-grip, and the index finger and the middle finger extended through the sockets a and 1' respectively. By closing the hand and drawing back the said fingers great force may be exerted on the carriage, such force being employed of course to draw back the rod m and withdraw the snare '11 into the cannula Z, said rod or having been previously adjusted by means of the nut p. As the carriage is grasped by the fingers at two points, one of which is between the braces a and c andthe other below the brace 6 binding or jamming is effectually prevented. In case additional force is required the thumb-screw or follower f, which is comparatively large, may be operated by the free hand against the outer edge of the sleeve t. As the movement of the rod m is directly longitudinal or in line with its length, and as the pull on the carriage is on two lines which are parallel with the line of movement of said rod, the strength of the operator is economized and may be utilized with a minimum of friction.

Having thus fully described my invention, what 1 claim, and desire to secure by Letters Patent, is:

1. In a surgical instrument of the character described, a skeleton handle of the general shape of a pistol-handle whereby a pistol-grip may he obtained, a frame comprising two parallel braces one above the other and both rigidly connected with and extending horizontally from the said handle, a carriage sliding on said braces and provided with a plurality of linger-holes or rings, a rod for holding the snare or operating tool, and mechanism intermediate of the carriage and said rod whereby the application of power to the finger-holes applies a direct longitudinal draft to the rod.

2. In a surgical instrument of the character described,

a frame provided with upper and lower parallel braces and suitable end-liars, a handle rigid with said frame and of the general shape of a pistol-handle whereby a pistol- 5 grip may be obtained, a carriage sliding on said upper and lower braces and provided with a plurality of finger-holes or rings, a tubular extension on the upper end of the front end-bar oi the frame, a bifurcated extension on the upper end of the carriage, an instrument or red for holding the 10 snare or operating tool extending through said extensions and parallel with said 'braces, and a hand-nut on the threaded portion of said rod Within the bifurcated extension, for the purpose set forth.

In testimony whereof I have signed my name to this specification in the presence of two subscribing witnesses. 15

THOMAS E. DUEFEE.

Witnesses:

WILLIAM H. PIERCE, FRED C. HANSCOM. 

